(* Created with the Wolfram Language : www.wolfram.com *)
<|"H" -> <|"Name" -> "Hydrogen", "AtomicNumber" -> 1, "AtomicMass" -> 1.008|>, 
 "He" -> <|"Name" -> "Helium", "AtomicNumber" -> 2, "AtomicMass" -> 4.002602|>, 
 "Li" -> <|"Name" -> "Lithium", "AtomicNumber" -> 3, "AtomicMass" -> 6.94|>, 
 "Be" -> <|"Name" -> "Beryllium", "AtomicNumber" -> 4, 
   "AtomicMass" -> 9.0121831|>, 
 "B" -> <|"Name" -> "Boron", "AtomicNumber" -> 5, "AtomicMass" -> 10.81|>, 
 "C" -> <|"Name" -> "Carbon", "AtomicNumber" -> 6, "AtomicMass" -> 12.011|>, 
 "N" -> <|"Name" -> "Nitrogen", "AtomicNumber" -> 7, "AtomicMass" -> 14.007|>, 
 "O" -> <|"Name" -> "Oxygen", "AtomicNumber" -> 8, "AtomicMass" -> 15.999|>, 
 "F" -> <|"Name" -> "Fluorine", "AtomicNumber" -> 9, 
   "AtomicMass" -> 18.998403163|>, 
 "Ne" -> <|"Name" -> "Neon", "AtomicNumber" -> 10, "AtomicMass" -> 20.1797|>, 
 "Na" -> <|"Name" -> "Sodium", "AtomicNumber" -> 11, 
   "AtomicMass" -> 22.98976928|>, 
 "Mg" -> <|"Name" -> "Magnesium", "AtomicNumber" -> 12, 
   "AtomicMass" -> 24.305|>, "Al" -> <|"Name" -> "Aluminium", 
   "AtomicNumber" -> 13, "AtomicMass" -> 26.9815385|>, 
 "Si" -> <|"Name" -> "Silicon", "AtomicNumber" -> 14, "AtomicMass" -> 28.085|>, 
 "P" -> <|"Name" -> "Phosphorus", "AtomicNumber" -> 15, 
   "AtomicMass" -> 30.973761998|>, 
 "S" -> <|"Name" -> "Sulfur", "AtomicNumber" -> 16, "AtomicMass" -> 32.06|>, 
 "Cl" -> <|"Name" -> "Chlorine", "AtomicNumber" -> 17, "AtomicMass" -> 35.45|>, 
 "Ar" -> <|"Name" -> "Argon", "AtomicNumber" -> 18, "AtomicMass" -> 39.948|>, 
 "K" -> <|"Name" -> "Potassium", "AtomicNumber" -> 19, 
   "AtomicMass" -> 39.0983|>, "Ca" -> <|"Name" -> "Calcium", 
   "AtomicNumber" -> 20, "AtomicMass" -> 40.078|>, 
 "Sc" -> <|"Name" -> "Scandium", "AtomicNumber" -> 21, 
   "AtomicMass" -> 44.955908|>, 
 "Ti" -> <|"Name" -> "Titanium", "AtomicNumber" -> 22, 
   "AtomicMass" -> 47.867|>, "V" -> <|"Name" -> "Vanadium", 
   "AtomicNumber" -> 23, "AtomicMass" -> 50.9415|>, 
 "Cr" -> <|"Name" -> "Chromium", "AtomicNumber" -> 24, 
   "AtomicMass" -> 51.9961|>, "Mn" -> <|"Name" -> "Manganese", 
   "AtomicNumber" -> 25, "AtomicMass" -> 54.938044|>, 
 "Fe" -> <|"Name" -> "Iron", "AtomicNumber" -> 26, "AtomicMass" -> 55.845|>, 
 "Co" -> <|"Name" -> "Cobalt", "AtomicNumber" -> 27, 
   "AtomicMass" -> 58.933194|>, 
 "Ni" -> <|"Name" -> "Nickel", "AtomicNumber" -> 28, "AtomicMass" -> 58.6934|>, 
 "Cu" -> <|"Name" -> "Copper", "AtomicNumber" -> 29, "AtomicMass" -> 63.546|>, 
 "Zn" -> <|"Name" -> "Zinc", "AtomicNumber" -> 30, "AtomicMass" -> 65.38|>, 
 "Ga" -> <|"Name" -> "Gallium", "AtomicNumber" -> 31, "AtomicMass" -> 69.723|>, 
 "Ge" -> <|"Name" -> "Germanium", "AtomicNumber" -> 32, 
   "AtomicMass" -> 72.63|>, "As" -> <|"Name" -> "Arsenic", 
   "AtomicNumber" -> 33, "AtomicMass" -> 74.921595|>, 
 "Se" -> <|"Name" -> "Selenium", "AtomicNumber" -> 34, 
   "AtomicMass" -> 78.971|>, "Br" -> <|"Name" -> "Bromine", 
   "AtomicNumber" -> 35, "AtomicMass" -> 79.904|>, 
 "Kr" -> <|"Name" -> "Krypton", "AtomicNumber" -> 36, "AtomicMass" -> 83.798|>, 
 "Rb" -> <|"Name" -> "Rubidium", "AtomicNumber" -> 37, 
   "AtomicMass" -> 85.4678|>, "Sr" -> <|"Name" -> "Strontium", 
   "AtomicNumber" -> 38, "AtomicMass" -> 87.62|>, 
 "Y" -> <|"Name" -> "Yttrium", "AtomicNumber" -> 39, 
   "AtomicMass" -> 88.90584|>, "Zr" -> <|"Name" -> "Zirconium", 
   "AtomicNumber" -> 40, "AtomicMass" -> 91.224|>, 
 "Nb" -> <|"Name" -> "Niobium", "AtomicNumber" -> 41, 
   "AtomicMass" -> 92.90637|>, "Mo" -> <|"Name" -> "Molybdenum", 
   "AtomicNumber" -> 42, "AtomicMass" -> 95.95|>, 
 "Tc" -> <|"Name" -> "Technetium", "AtomicNumber" -> 43, "AtomicMass" -> 97.|>, 
 "Ru" -> <|"Name" -> "Ruthenium", "AtomicNumber" -> 44, 
   "AtomicMass" -> 101.07|>, "Rh" -> <|"Name" -> "Rhodium", 
   "AtomicNumber" -> 45, "AtomicMass" -> 102.9055|>, 
 "Pd" -> <|"Name" -> "Palladium", "AtomicNumber" -> 46, 
   "AtomicMass" -> 106.42|>, "Ag" -> <|"Name" -> "Silver", 
   "AtomicNumber" -> 47, "AtomicMass" -> 107.8682|>, 
 "Cd" -> <|"Name" -> "Cadmium", "AtomicNumber" -> 48, 
   "AtomicMass" -> 112.414|>, 
 "In" -> <|"Name" -> "Indium", "AtomicNumber" -> 49, "AtomicMass" -> 114.818|>, 
 "Sn" -> <|"Name" -> "Tin", "AtomicNumber" -> 50, "AtomicMass" -> 118.71|>, 
 "Sb" -> <|"Name" -> "Antimony", "AtomicNumber" -> 51, 
   "AtomicMass" -> 121.76|>, "Te" -> <|"Name" -> "Tellurium", 
   "AtomicNumber" -> 52, "AtomicMass" -> 127.6|>, 
 "I" -> <|"Name" -> "Iodine", "AtomicNumber" -> 53, 
   "AtomicMass" -> 126.90447|>, 
 "Xe" -> <|"Name" -> "Xenon", "AtomicNumber" -> 54, "AtomicMass" -> 131.293|>, 
 "Cs" -> <|"Name" -> "Caesium", "AtomicNumber" -> 55, 
   "AtomicMass" -> 132.90545196|>, 
 "Ba" -> <|"Name" -> "Barium", "AtomicNumber" -> 56, "AtomicMass" -> 137.327|>, 
 "La" -> <|"Name" -> "Lanthanum", "AtomicNumber" -> 57, 
   "AtomicMass" -> 138.90547|>, 
 "Ce" -> <|"Name" -> "Cerium", "AtomicNumber" -> 58, "AtomicMass" -> 140.116|>, 
 "Pr" -> <|"Name" -> "Praseodymium", "AtomicNumber" -> 59, 
   "AtomicMass" -> 140.90766|>, 
 "Nd" -> <|"Name" -> "Neodymium", "AtomicNumber" -> 60, 
   "AtomicMass" -> 144.242|>, "Pm" -> <|"Name" -> "Promethium", 
   "AtomicNumber" -> 61, "AtomicMass" -> 145.|>, 
 "Sm" -> <|"Name" -> "Samarium", "AtomicNumber" -> 62, 
   "AtomicMass" -> 150.36|>, "Eu" -> <|"Name" -> "Europium", 
   "AtomicNumber" -> 63, "AtomicMass" -> 151.964|>, 
 "Gd" -> <|"Name" -> "Gadolinium", "AtomicNumber" -> 64, 
   "AtomicMass" -> 157.25|>, "Tb" -> <|"Name" -> "Terbium", 
   "AtomicNumber" -> 65, "AtomicMass" -> 158.92535|>, 
 "Dy" -> <|"Name" -> "Dysprosium", "AtomicNumber" -> 66, 
   "AtomicMass" -> 162.5|>, "Ho" -> <|"Name" -> "Holmium", 
   "AtomicNumber" -> 67, "AtomicMass" -> 164.93033|>, 
 "Er" -> <|"Name" -> "Erbium", "AtomicNumber" -> 68, "AtomicMass" -> 167.259|>, 
 "Tm" -> <|"Name" -> "Thulium", "AtomicNumber" -> 69, 
   "AtomicMass" -> 168.93422|>, 
 "Yb" -> <|"Name" -> "Ytterbium", "AtomicNumber" -> 70, 
   "AtomicMass" -> 173.045|>, "Lu" -> <|"Name" -> "Lutetium", 
   "AtomicNumber" -> 71, "AtomicMass" -> 174.9668|>, 
 "Hf" -> <|"Name" -> "Hafnium", "AtomicNumber" -> 72, "AtomicMass" -> 178.49|>, 
 "Ta" -> <|"Name" -> "Tantalum", "AtomicNumber" -> 73, 
   "AtomicMass" -> 180.94788|>, 
 "W" -> <|"Name" -> "Tungsten", "AtomicNumber" -> 74, "AtomicMass" -> 183.84|>, 
 "Re" -> <|"Name" -> "Rhenium", "AtomicNumber" -> 75, 
   "AtomicMass" -> 186.207|>, 
 "Os" -> <|"Name" -> "Osmium", "AtomicNumber" -> 76, "AtomicMass" -> 190.23|>, 
 "Ir" -> <|"Name" -> "Iridium", "AtomicNumber" -> 77, 
   "AtomicMass" -> 192.217|>, "Pt" -> <|"Name" -> "Platinum", 
   "AtomicNumber" -> 78, "AtomicMass" -> 195.084|>, 
 "Au" -> <|"Name" -> "Gold", "AtomicNumber" -> 79, 
   "AtomicMass" -> 196.966569|>, 
 "Hg" -> <|"Name" -> "Mercury", "AtomicNumber" -> 80, 
   "AtomicMass" -> 200.592|>, "Tl" -> <|"Name" -> "Thallium", 
   "AtomicNumber" -> 81, "AtomicMass" -> 204.38|>, 
 "Pb" -> <|"Name" -> "Lead", "AtomicNumber" -> 82, "AtomicMass" -> 207.2|>, 
 "Bi" -> <|"Name" -> "Bismuth", "AtomicNumber" -> 83, 
   "AtomicMass" -> 208.9804|>, "Po" -> <|"Name" -> "Polonium", 
   "AtomicNumber" -> 84, "AtomicMass" -> 209.|>, 
 "At" -> <|"Name" -> "Astatine", "AtomicNumber" -> 85, "AtomicMass" -> 210.|>, 
 "Rn" -> <|"Name" -> "Radon", "AtomicNumber" -> 86, "AtomicMass" -> 222.|>, 
 "Fr" -> <|"Name" -> "Francium", "AtomicNumber" -> 87, "AtomicMass" -> 223.|>, 
 "Ra" -> <|"Name" -> "Radium", "AtomicNumber" -> 88, "AtomicMass" -> 226.|>, 
 "Ac" -> <|"Name" -> "Actinium", "AtomicNumber" -> 89, "AtomicMass" -> 227.|>, 
 "Th" -> <|"Name" -> "Thorium", "AtomicNumber" -> 90, 
   "AtomicMass" -> 232.0377|>, "Pa" -> <|"Name" -> "Protactinium", 
   "AtomicNumber" -> 91, "AtomicMass" -> 231.03588|>, 
 "U" -> <|"Name" -> "Uranium", "AtomicNumber" -> 92, 
   "AtomicMass" -> 238.02891|>, 
 "Np" -> <|"Name" -> "Neptunium", "AtomicNumber" -> 93, "AtomicMass" -> 237.|>, 
 "Pu" -> <|"Name" -> "Plutonium", "AtomicNumber" -> 94, "AtomicMass" -> 244.|>, 
 "Am" -> <|"Name" -> "Americium", "AtomicNumber" -> 95, "AtomicMass" -> 243.|>, 
 "Cm" -> <|"Name" -> "Curium", "AtomicNumber" -> 96, "AtomicMass" -> 247.|>, 
 "Bk" -> <|"Name" -> "Berkelium", "AtomicNumber" -> 97, "AtomicMass" -> 247.|>, 
 "Cf" -> <|"Name" -> "Californium", "AtomicNumber" -> 98, 
   "AtomicMass" -> 251.|>, "Es" -> <|"Name" -> "Einsteinium", 
   "AtomicNumber" -> 99, "AtomicMass" -> 252.|>, 
 "Fm" -> <|"Name" -> "Fermium", "AtomicNumber" -> 100, "AtomicMass" -> 257.|>, 
 "Md" -> <|"Name" -> "Mendelevium", "AtomicNumber" -> 101, 
   "AtomicMass" -> 258.|>, "No" -> <|"Name" -> "Nobelium", 
   "AtomicNumber" -> 102, "AtomicMass" -> 259.|>, 
 "Lr" -> <|"Name" -> "Lawrencium", "AtomicNumber" -> 103, 
   "AtomicMass" -> 262.|>, "Rf" -> <|"Name" -> "Rutherfordium", 
   "AtomicNumber" -> 104, "AtomicMass" -> 267.|>, 
 "Db" -> <|"Name" -> "Dubnium", "AtomicNumber" -> 105, "AtomicMass" -> 270.|>, 
 "Sg" -> <|"Name" -> "Seaborgium", "AtomicNumber" -> 106, 
   "AtomicMass" -> 269.|>, "Bh" -> <|"Name" -> "Bohrium", 
   "AtomicNumber" -> 107, "AtomicMass" -> 270.|>, 
 "Hs" -> <|"Name" -> "Hassium", "AtomicNumber" -> 108, "AtomicMass" -> 270.|>, 
 "Mt" -> <|"Name" -> "Meitnerium", "AtomicNumber" -> 109, 
   "AtomicMass" -> 278.|>, "Ds" -> <|"Name" -> "Darmstadtium", 
   "AtomicNumber" -> 110, "AtomicMass" -> 281.|>, 
 "Rg" -> <|"Name" -> "Roentgenium", "AtomicNumber" -> 111, 
   "AtomicMass" -> 281.|>, "Cn" -> <|"Name" -> "Copernicium", 
   "AtomicNumber" -> 112, "AtomicMass" -> 285.|>, 
 "Nh" -> <|"Name" -> "Nihonium", "AtomicNumber" -> 113, "AtomicMass" -> 286.|>, 
 "Fl" -> <|"Name" -> "Flerovium", "AtomicNumber" -> 114, 
   "AtomicMass" -> 289.|>, "Mc" -> <|"Name" -> "Moscovium", 
   "AtomicNumber" -> 115, "AtomicMass" -> 289.|>, 
 "Lv" -> <|"Name" -> "Livermorium", "AtomicNumber" -> 116, 
   "AtomicMass" -> 293.|>, "Ts" -> <|"Name" -> "Tennessine", 
   "AtomicNumber" -> 117, "AtomicMass" -> 293.|>, 
 "Og" -> <|"Name" -> "Oganesson", "AtomicNumber" -> 118, 
   "AtomicMass" -> 294.|>|>
